Librivox recording of The Origin of Species by Means of Natural Selection, by Charles Darwin.

Charles Darwin's Origin of Species (publ. 1859) is a pivotal work in scientific literature and arguably the pivotal work in evolutionary biology. The book's full title is On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life. It introduced the theory that populations evolve over the course of generations through a process of natural selection. It was controversial because it contradicted religious beliefs which underlay the then current theories of biology. Darwin's book was the culmination of evidence he had accumulated on the voyage of the Beagle in the 1830s and added to through continuing investigations and experiments since his return.
(Summary from Wikipedia)

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An essential text read by volunteers at a high quality of production. I'm not a fan of Librivox's multi-reader productions, but it works very well for Darwin's rambling and detailed survey of the evidence for natural selection as the cause of the evolution of species over time. The multiplicity of voices (including at least two ESL readers) underlines the universal appeal and essential humanism of Darwin's revolutionary insights.